Switchgear Protections Multiple Choice Questions and Answers Preparation for Competition exams pdf

1.    The main function of a fuse is to
(a)     protect the line
(b)     open the circuit
(c)    protect the appliance
(d)    prevent excessive currents
(e)    none of the above
Ans: d

2.    On which of the following routine tests are conducted ?
(a)    Oil circuit breakers
(b)    Air blast circuit breakers
(c)    Minimum oil circuit breakers
(d)    All of the above
Ans: d

3.    SF6 gas
(a)    is yellow in colour
(b)    is lighter than air
(c)    is nontoxic
(d)    has pungent small
(e)    none of the above
Ans: c
 
4. The arcing contacts in a circuit breaker are made of
(a)     copper tungsten alloy
(b)     porcelain
(c)    electrolytic copper
(d)    aluminium alloy
Ans: a

5. Which  of the following  medium is employed for extinction of arc in air circuit breaker ?
(a) Water   
(b) Oil
(c) Air   
(d) SF6
Ans: c

6. With which of the following, a circuit breaker must be equipped for remote operation ?
(a) Inverse time trip
(b) Time-delay trip
(c) Shunt trip   
(d) None of the above
(e) All of the above
Ans: c

7.    Fault diverters are basically
(a) fuses   
(b) relays
(c) fast switches    
(d) circuit breakers
Ans: c

8.    A thermal protection switch can protect against
(a) short-circuit     
(b) temperature
(c) overload   
(d) over voltage
Ans: c

9.    Arc in a circuit behaves as
(a)     a capackive reactance
(b)     an inductive reactance
(c)    a resistance increasing with voltage rise across the arc
(d)    a resistance decreasing with voltage rise across the arc
Ans: d

10.    Thermal circuit breaker has
(a)    delayed trip action
(b)    instantaneous trip action
(c)    both of the above
(d)    none of the above
Ans: a

Read More Questions:
Switchgear Protections MCQs Part1
Switchgear Protections MCQs Part2
Switchgear Protections MCQs Part3
Switchgear Protections MCQs Part4
Switchgear Protections MCQs Part5
Switchgear Protections MCQs Part6
Switchgear Protections MCQs Part7
Switchgear Protections MCQs Part8
Switchgear Protections MCQs Part9
Switchgear Protections MCQs Part10
Switchgear Protections MCQs Part11